Antenna



FIG. 1 is a first perspective view showing our design for an antenna;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof, enlarged to show additional detail;

FIG. 5 is a bottom plan view thereof, enlarged to show additional detail;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof; and,

FIG. 8 is a second perspective view thereof.

The broken lines in the figures represent features of the antenna which form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 